Add subscription qr code share

lib/features/common/qr_code_dialog.dart

@@ -0,0 +1,61 @@
+import 'package:flutter/material.dart';
+import 'package:qr_flutter/qr_flutter.dart';
+
+class QrCodeDialog extends StatelessWidget {
+  const QrCodeDialog(
+    this.data, {
+    super.key,
+    this.message,
+    this.width = 268,
+    this.backgroundColor = Colors.white,
+  });
+
+  final String data;
+  final String? message;
+  final double width;
+  final Color backgroundColor;
+
+  Future<void> show(BuildContext context) async {
+    await showDialog(context: context, builder: (context) => this);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+
+    return Padding(
+      padding: const EdgeInsets.all(8.0),
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          SizedBox(
+            width: width,
+            child: QrImageView(
+              data: data,
+              backgroundColor: backgroundColor,
+            ),
+          ),
+          if (message != null)
+            SizedBox(
+              width: width,
+              child: Material(
+                color: theme.colorScheme.background,
+                child: Row(
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  children: [
+                    Flexible(
+                      child: Text(
+                        message!,
+                        overflow: TextOverflow.ellipsis,
+                        style: TextStyle(color: theme.colorScheme.onBackground),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
+            ),
+        ],
+      ),
+    );
+  }
+}